单项选择题

A．They are necessary for modern man.
B．They are unnecessary for survival.
C．They are as good as computers.
D．They are dangerous for us.
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单项选择题
A．Hang up the phone.B．Call her friend immediately.C．Get the telephone right now.D．Pass the exam as Bob di
A．Hang up the phone.
B．Call her friend immediately.
C．Get the telephone right now.
D．Pass the exam as Bob di
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